Rhodium-catalyzed 1,4-addition of alkenylzirconocene chlorides to electron deficient alkenes
作者:Akito Kakuuchi、Takeo Taguchi、Yuji Hanzawa
DOI:10.1016/j.tet.2003.08.073
日期:2004.2
acid esters, and α,β-enoic acid amides can be efficiently achieved by the use of [RhCl(cod)]2 catalyst. A high diastereoselectivity (95% yield, 90% de) was obtained through the reaction of α,β-enoic acid amide derived from Oppolzer'ssultam and 2-butenoyl chloride, while the use of Evans' chiral oxazolidinone as a chiral auxiliary in place of Oppolzer'ssultam gave a poor diastereoselectivity (98% yield
A Ring‐Closing Metathesis Approach to Cyclic α,β‐Dehydroamino Acids
作者:Koen F. W. Hekking、Dennis C. J. Waalboer、Marcel A. H. Moelands、Floris L. van Delft、Floris P. J. T. Rutjes
DOI:10.1002/adsc.200700308
日期:2008.1.4
the synthesis and ring-closingmetathesis (RCM) of α,β-dehydroamino acids is described. This sequence has led to the formation of a range of biologically relevant functionalized nitrogen heterocycles. The incorporation of chiral building blocks in the RCM precursors eventually resulted in the formation of optically active 4-substituted cyclic dehydroamino acids. In addition, olefin isomerization under